摘要：可缩放组密钥更新是大型动态组通信需要面对的一个重要问题。
Absrtact: Scalable group rekeying is one of the biggest challenges that need to be addressed to support secure communications for large and dynamic groups.
针对有实时性需求的分布式组通信应用问题，提出基于哈希函数和BD协议的组密钥更新机制。
A scheme of re-keying management based on key chain and BD protocol applied to real-time distributed communication is proposed.
论文重点对节能的密钥分发、安全和高效的组密钥更新以及密钥预分发等组密钥管理的关键问题进行研究。
The group key management problems this thesis studies mainly include energy-saving multicast key distribution, secure and efficient group rekeying, and key pre-distribution.
针对普适环境中节点随时加入和退出群组的特点，设计了组密钥更新协议，保证了组密钥的前向和后向安全性。
Concerning nodes' free joining and leaving the group, group key renewing protocol was proposed, which could guarantee the forward security and backward security of the group key.
而组播密钥更新是其中的一个热点问题。
And key update is one of the important problems in this subject.
为达到完美向前和完美向后保密以及对付密码分析，需要更新组会话密钥。
In order to achieve perfect forward and perfect backward secrecy, and to counteract cryptoanalysis, the group session keys should be rekeyed.
当组播规模很大时，更新组密钥的效率是一个重要的问题。
When the size of the multicast is large, the efficiency of rekeying is a very important problem.
本文探讨的重点是组播密钥管理如何为组成员生成组密钥、分发组密钥和更新组密钥，以及由此产生的扩展性、健壮性和可靠性问题。
The emphases of this paper are to find methods for multicast key management, which is to generate, distribute and update keys and to solve the problem of scalability, robustness and reliability.
其中重点讨论了目前流行的组播密钥管理框架，密钥树，分隙密钥更新方案。
And we mainly focus on the distributed key management framework: IGKMP and lolus , the rekeying protocol based on key tree , and periodical rekeying strategies.
基于该密钥管理模型的算法包含了密钥的生成、组密钥协商、密钥更新、节点加入处理和退出处理等子算法。
The key management algorithm based on the new scheme includes several sub algorithms, such as key generation, group key agreement, key update, nodes joining operation and nodes existing operation.
组密钥的更新由低层管理域触发，由子组管理者产生新的组密钥并发送给所有的管理域。
Group rekey is triggered by the managers in the lower layer. The new group key is produced by the group manager and is distributed to all other managers except itself.
组密钥的更新由低层管理域触发，由子组管理者产生新的组密钥并发送给所有的管理域。
Group rekey is triggered by the managers in the lower layer. The new group key is produced by the group manager and is distributed to all other managers except itself.
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